PDP-4280HD
53
5
6
7
8
5
6
7
8
C
D
F
A
B
E
5.2.5 MAIN ASSY
Flowchart of Failure Analysis for The MAIN Assy
Failure in the RST IC (IC8302) output or its peripheral circuits
No
Replace the MAIN Assy.
No
Turn the POWER switch on.
The STB LED does not light although
STB 3.3 V power is supplied.
Does the POWER switch on?
No
Is the M11 connector securely
connected?
Securely connect the M11 connector.
Yes
Yes
Is the cable that is connected to
the M11 connector broken?
Replace the cable (J115).
No
No
No
No
No
No
The RELAY port does not work.
The power is not turned on.
Is voltage at REQ_IF on the MAIN
Assy High (3.3 V)?
Can the unit be turned on, using
the remote control unit?
Can the unit be turned on, using
the Power switch on the unit?
Can the unit be turned on, using
RS-232C commands?
Yes
Yes
Is resetting of the IF
microcomputer canceled?
Failure in the line between the IF microcomputer and M11 connector
Failure in the RS-232C driver and its
peripheral circuits
Failure in the Main microcomputer.
No
Replace the MAIN Assy.
Yes
Is the voltage at Pin 3 of the M11
connector High?
Relay control is unable unless it supplies a power supply to the module microcompute.
No
Replace the MAIN Assy.
No
Turn the POWER switch on.
Does the POWER switch on?
Yes
Yes
Is the voltage at Pin 3 of the M1
connector 3.3 V?
• Failure in the output of REG IC (IC4501).
• Is active low?
No
Replace the MAIN Assy.
Yes
Are the voltages (3.3 V/2.5 V/1.5 V)
supplied to the main microcomputer?
No problem with the MAIN Assy.
Check the LED Assy.
No
Yes
Yes
Yes
Replace the cable that connects
between the IR and MAIN Assys.
Replace the cable that connects
between the SIDE KEY and MAIN Assys.
Replace the IR Assy.
Replace the SIDE KEY Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
No
No
Failure analysis for the
MAIN Assy => MA1
Failure analysis for the
MAIN Assy => MA2
Summary of Contents for PDP-4280HD
Page 10: ...PDP 4280HD 10 1 2 3 4 1 2 3 4 C D F A B E 2 2 SPECIFICATIONS Dimensions ...
Page 11: ...PDP 4280HD 11 5 6 7 8 5 6 7 8 C D F A B E 2 3 PANEL FACILITIES Front Section ...
Page 12: ...PDP 4280HD 12 1 2 3 4 1 2 3 4 C D F A B E Rear Section ...
Page 13: ...PDP 4280HD 13 5 6 7 8 5 6 7 8 C D F A B E Remote Control Unit ...
Page 19: ...PDP 4280HD 19 5 6 7 8 5 6 7 8 C D F A B E ...
Page 20: ...PDP 4280HD 20 1 2 3 4 1 2 3 4 C D F A B E 4 BLOCK DIAGRAM 4 1 OVERALL WIRING DIAGRAM 1 2 ...
Page 22: ...PDP 4280HD 22 1 2 3 4 1 2 3 4 C D F A B E 4 2 OVERALL WIRING DIAGRAM 2 2 ...
Page 23: ...PDP 4280HD 23 5 6 7 8 5 6 7 8 C D F A B E ...
Page 35: ...PDP 4280HD 35 5 6 7 8 5 6 7 8 C D F A B E ...
Page 168: ...PDP 4280HD 168 1 2 3 4 1 2 3 4 C D F A B E 10 6 PANEL CHASSIS SECTION ...
Page 172: ...PDP 4280HD 172 1 2 3 4 1 2 3 4 C D F A B E 10 8 PDP SERVICE ASSY 428 Exterior Section ...